Putting the full ref qualifier git push origin HEAD:refs/heads/testing-branch makes it work.

No I don’t think that's the issue, the current code works on push events but not on pull_request events due to a permission issue. This sounds like GitHub is giving a token with reduced permissions to PRs, as expected.

setup-git-user/.github/workflows/test.yml

Line 25 in 5ede2be

git push origin HEAD:testing-branch

Putting the full ref qualifier git push origin HEAD:refs/heads/testing-branch makes it work.

This works as tested here:

Can you send this PR from your fork? https://github.com/fregante/setup-git-user/pull/3/files

It's weird that they'd allow a fork to push to either repo

Can you send this PR from your fork? https://github.com/fregante/setup-git-user/pull/3/files

It's weird that they'd allow a fork to push to either repo

Yeah fails to work. The problem now is about remotes.

Yeah, so it defeats the purpose of being included for PRs.

Thanks for working with me on this